Process optimizing (Ordering)

We have Problems with our ordering process and want to optimize some things. 1. clean up the bugs, increase speed - cache and index (article attribute) still not fully working, missing data table fields? - indexes can be rebuilt via shell - we do have Siteground hosting "PLUS" - you may create your own ssh-key via siteground backend - db scan for bugs - export / import via cart2cart ([login to view URL]) to have a clean database 2. we want a module box on the right side for special offers and product highlighting - what can be done? 3. crosslinking / cross-selling - advertise products from same category or with same attributes (color, design)